Rotary lithographic machine.



- PATENTED NOV. 27, 1906.

H. .BITTNER.

ROTARY LITHOGRAPHIG MACHINE.

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APPLICATION FILED JAN. 27. 1906.

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PATENTED NOV. 27, 1906.

H. BITTNER. ROTARYLITH'OGRAPHIO MACHINE.

APPLICATION FILED JAN. 27. 1906.

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UNITED STATES PATENT OFFICE.

HUGO BITTNER, or PARIS, FRANCE, ASSIGNOR TO LA SOOIETE LART INDUSTRIEL, OF PARIS, FRANCE.

ROTARY LITHOGRAPHIC MACHINE.

Patented Nov. 27, 1906.

Annlioation filed an ary 27,1906- Seri 1N =298,259.

To all whom it may concern.-

Be'it known that I, HUGO BITTNER, a citizen of the Emplre of Austr1aHungary, residing in Paris, France, have mvented certain 1 new and useful Improvements in Rotary Lithographic Machines, of which the following is a specification.

This invention relates to improvements in rotary lithographic machines.

One of the objects of the invention is to provide an improved mounting for the stone cylinders embodied in such machines.

A further object of the invention is to furnish improved means for shifting the impression-cylinder with respect to the stone cylinder.

With these ends in view the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

In the accompanying drawings, in which the same reference characters denote the same parts throughout the several views, Figure 1 is a longitudinal section of a stone cylinder mounted in accordance with the invention. Fig. 2 is a front elevation showing a stone cylinder and impression-cylinder and mechanism according to this invention for shifting the latter toward and away from the former. Fig. 3 is a side elevation of Fig. 2, showing the parts in printing position; and Fig. l is a similar side elevation showing the impression-cylinder out of contact with the stone cylinder.

With the object of obviating the defects due to breakages caused by directlyfixing the stone cylinder upon the shaft by means of checks pressed against the ends of the cylinderby means of screws and nuts the following arrangement is adopted: The stone cylinder a, is centered on the shaft 1), Fig. 1, and is tightly pressed between two disks 0. The extremities of the stone at are turned conical. The conical portions (1. fit into the disks, which are themselves conically hollowed. Between the disks and the stone there are interposed layers d of vulcanized rubber. The disks are pressed toward the shoulder e of the shaft by means of a nut f. One of these disks abuts against said shoulder. The screw-threading of the shaft, which permits of screwing the nut f, is directed oppositely to the direction of rotation in such a manner that the operation of the machine may not tend to loosen the cylinder. The means for j lifting the pressure-cylinder g, Figs. 2, 3, and 4, comprises, broadly, eccentrics hh, Fig. 2, keyed upon a shaft i. This shaft rotates in supports or bearings adjustable vertically in the checks of the frame, the said eccentric acting upon the vertically-diplaceable bearings Z Z, in which the shaft m of the pressurecylinder g turns. A lever is, arranged at the end of the shaft i, serves to operate said eccentrics.

The cylinder g may be raised and applied against the stone, zinc, aluminium, or the like cylinder 0, Fig. 3, or freed therefrom, Fig. 4.

The supports 11 i may be adjusted in height by means of the screws n, which engage the same at their lower portions.

Having thus described my invention, I claim as new and desire to secure by Letters Patent In a lithographic machine, in combination, a stone cylinder, an impression-cylinder parallel thereto, bearings for said impressioncylinder which are slidable toward and away HUGO BITTNER.

l Vitnesses:

EMILE LEDRET, FREDERIO U. LAULDUGEE.

from said stone cylinder, a shaft, eccentrics 

